Calibration conditions
Limit gauges for checking smooth parts

The temperature of the gauge and that of the part to be tested must be substantially identical, and all the closer to the reference temperature (20°C) that their coefficients of expansion differ.

A Between gauge, applied by hand without exerting excessive force, must be able to pass over or through the element it is checking.

A N'Entre Pas gauge, applied by hand without exerting excessive force, must not be able to pass over or into...